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MINE ID # OR PROSPECTING ID #: M-1993-004 INSPECTION DATE: 3123/2006 (Page 2) INSPECTOR'S INITIALS: CMR, HHP This was a normal monitoring inspection of the Navajo Clay Pit conducted by Chris Rowe and Harry Posey of the Colorado Division of Minerals and Geology. Jason McGraw and Greg ~ were present as the representatives of the Robinson Brick Company the operator of the mine. The Navajo Clay Pit is located approximately 10 miles northwest of Kiowa. The pit is immediately east of an ephemeral unnamed tributary of Kiowa Creek. Mining began in 2000, with current disturbance at 15.8 acres. The permitted mine area is 200 acres with a maximum affected area of 62 acres. There are three main features to the mine. The 1200- foot access road that comes in from County Road 174, and is generally in good condition and has the correct entrance sign. The pad area has several large clay stockpiles on it, and has a vegetated topsoil stockpile along the south and eastern edge. The actual pit is along the western affected area boundary and immediately adjacent to the unnamed ephemeral tributary. The pit is rectangular, and is approximately 600 feet long and 100 feet wide. There is overburden along the west and north sides of the pit, and a vegetated topsoil pile just beyond the overburden pile. The overburden pile acts as a levee between the tributary and pit. The remainder of the site is vegetated with grasses and some shrubs. Specific observations of note include: The bottom of the pit contains standing water of unknown depth. There appears to be water in the pit most or all of the time. The last time the pit was mined was in 2000. The proximity to the unnamed ephemeral tributary suggests that the source may be ground water, but it may also be surface water runoff from the pad area. There is not any water management included in the Operation Plan. Impounded water is required to be managed (C.R.S. 34-32.5-116, Mineral Rules and Regulations 3.1.6, and others). A determination of the sources of the water in the pit is needed. Once the source of the water is determined, a Technical Revision to the mine permit to cover the management of the impounded water may be needed. Because this may involve water quality and quality issues, further consultation with the State Engineers Office and the Water Quality Control Division may also be needed, There is a steep erosive gully that leads from the pad area to the pit. These gullies drain to the pit, so there is not currently any offsite discharge. If offsite discharge becomes necessary due to the problems listed above, stormwater controls may be needed to reduce the continued erosion from the gully. Enforcement and Inspection Contact Address NAME: Michael Leidich OPERATOR: Robinson Brick COfn DanV STREET: 1845 W. Dartmouth Ave. CITY/STATE/ZIP: Englewood. CO 80110 cc: U.S. Army Corps of Engineers U,S. Bureau of Land Management X_ U.S. Forest Service X_ CO Department of Transportation CO Hazardous Materials and Waste Division CO State Engineers Office CO Water Quality Control Division OTHER: